In scenes airing in Thursday's episode, Davis became angry following another tense round of nominations and became embroiled in an argument with Danniella Westbrook who told her, "You'll never work again off the back of this show."

In the Diary Room, she decided to exit the house and asked, "Where's Jez please? I am leaving right now. I'm not doing this anymore," before fleeing to the detox clinic to find Jeremy McConnell.

With tempers flaring, Davis was called back to the Diary Room where security were forced to intervene to calm her down.

It is the second time that security have been called into the house in as many weeks after Megan McKenna had to be restrained during a row with John Partridge and Tiffany Pollard.

Before this series, security had not entered the house in 10 years.

Davis's unhappiness began earlier in the day when she was confirmed as one of the "toxic" housemates to be treated by TV nutritionist Gillian McKeith, alongside McConnell, Pollard and Darren Day.

The nominations, to be revealed in the show, by the remaining "pure" housemates further upset Pollard and Davis who had both been drinking.

Asked to return to the detox clinic, Davis screamed: "I'm not going in! I've given you more entertainment than anything you could wish for!" before returning to the living area in a frenzied manner and announcing that the house was sending her mad.

In response to Westbrook's observation that she was self-destructing, Davis lashed out: "Never speak to me again after this."

Growing more frantic, Davis entered the Diary Room but refused to be filmed and threatened to leave the house, at which point security was called for her own safety.

She was eventually allowed to leave the room and sought the comfort of McConnell in the detox clinic where the pair decided to leave the house together.

"Danniella went I will never work again after this show. Laughing in my face! I want to go now," she told him.

"I only want to be with you," he replied.

But their resolve was weakened by a chat with Big Brother and the two returned to the detox clinic alone where they shared a bed together and Davis can be heard saying: "Thanks for looking after me."

"My life has been turned upside down by this programme," she admitted.

With the rest of the house reeling from the events of the night, Westbrook confided her regret at telling Davis she had ruined her career.

"I don't want her to fall apart in front of everyone, it's not a good place, it's hard to come back from. I feel so sorry for her, she's so beautiful. I wish I had kept my mouth shut. I know along the way that people have tried to help me, and I've broken their hearts," she told Partridge, Day and Collins.

If the events of Davis's breakdown did not provide enough gruesome entertainment, McKeith also examines the "toxic" housemates' stool samples in the episode, which leads to some surprising revelations and an angry outburst from Pollard.